path: root/net/mpls/mpls_iptunnel.c
diff options
authorDavid Ahern <dsa@cumulusnetworks.com>2016-08-24 20:10:44 -0700
committerDavid S. Miller <davem@davemloft.net>2016-08-30 22:27:18 -0700
commit48d2ab609b6bbecb7698487c8579bc40de9d6dfa (patch)
treeb4f68767d70023041a98e1a03cd23711bca754d9 /net/mpls/mpls_iptunnel.c
parent14972cbd34ff668c390cbd2e6497323484c9e812 (diff)
net: mpls: Fixups for GSO
As reported by Lennert the MPLS GSO code is failing to properly segment large packets. There are a couple of problems: 1. the inner protocol is not set so the gso segment functions for inner protocol layers are not getting run, and 2 MPLS labels for packets that use the "native" (non-OVS) MPLS code are not properly accounted for in mpls_gso_segment. The MPLS GSO code was added for OVS. It is re-using skb_mac_gso_segment to call the gso segment functions for the higher layer protocols. That means skb_mac_gso_segment is called twice -- once with the network protocol set to MPLS and again with the network protocol set to the inner protocol. This patch sets the inner skb protocol addressing item 1 above and sets the network_header and inner_network_header to mark where the MPLS labels start and end. The MPLS code in OVS is also updated to set the two network markers. >From there the MPLS GSO code uses the difference between the network header and the inner network header to know the size of the MPLS header that was pushed. It then pulls the MPLS header, resets the mac_len and protocol for the inner protocol and then calls skb_mac_gso_segment to segment the skb. Afterward the inner protocol segmentation is done the skb protocol is set to mpls for each segment and the network and mac headers restored. Reported-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls/mpls_iptunnel.c')
1 files changed, 4 insertions, 0 deletions
diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c
index aed872cc05a6..cf52cf30ac4b 100644
--- a/net/mpls/mpls_iptunnel.c
+++ b/net/mpls/mpls_iptunnel.c
@@ -90,7 +90,11 @@ static int mpls_xmit(struct sk_buff *skb)
if (skb_cow(skb, hh_len + new_header_size))
goto drop;
+ skb_set_inner_protocol(skb, skb->protocol);
+ skb_reset_inner_network_header(skb);
skb_push(skb, new_header_size);
skb->dev = out_dev;